With the increase of water content of Al203, the slag resistance of refractory products is improved. However, its corrosion resistance to partial alkali slag is less than that of partial alkali refractory insulation materials. The decrease of water content of residue is beneficial to improve the slag resistance. At the same time, the relative density of the crystal is increased. Reducing porosity is a reasonable measure to improve slag resistance. The heat transfer of refractory bricks is higher than that of clay bricks, which is related to the reduction of slope glass in refractory products and the increase of mullite crystals or corundum crystals.
The high temperature characteristics of refractory products are related to the external economic structure of handicrafts. The heat resistance of part of the culture medium is much lower than that of part of the particles, and the slag corrodes part of the culture medium first in the application. Therefore, it is possible to choose to improve and adjust the composition and structure of the cultivation substrate of handicrafts to improve the high temperature performance index of handicrafts.
What are the refractory bricks of silica-aluminum?
Ordinary firebrick
The key mineral of refractory brick is mullite. Corundum and laminated glass phase. With the increase in the water content of A12O3 in handicrafts, mullite and corundum are also increased, laminated glass is relatively reduced, and the fire resistance and high temperature characteristics of handicrafts are also improved. General firebrick has a series of fireproof material characteristics, better than clay crafts, easy to use, a wide range of raw materials. Used in various thermal instrument kilns. Compared with clay insulated brick, the service life of kiln can be reasonably improved.
2. High load soft firebrick.
Compared with the general refractory brick, high-load soft refractory brick is different from a part of the cultivation medium and a part of the fusion agent: a part of the cultivation medium in addition to the addition of three-stone concentrate, but also according to the basic theoretical composition of the organic chemical composition after combustion close to mullite, effectively introduce refractory raw materials, such as corundum powder, refractory corundum powder; The fusion agent is ball clay, etc., and different clay composite agents or mullite fusion agents are selected according to different types. The load softening temperature of firebrick can be increased by about 60~75℃.
3. Low creep refractory brick.
According to the selected unbalanced reaction, the creep resistance of refractory brick is improved. That is, according to the application temperature of the kiln, tristone mineral substances are added to the cultivation substrate. Active iron oxide and so on, so that the composition of the culture substrate is close to or completely composed of mullite. Due to the mullite fossilization of the cultivated substrate, the water content of mullite in the raw material will eventually increase, and the water content of laminated glass will decrease, and the excellent structural mechanical and thermal properties of mullite are conducive to improving the high temperature characteristics of the raw material. In order to completely mullite the culture substrate, it is important to operate Al203/siO2. Low creep refractory bricks are used in thermal instrument kilns such as hot blast furnaces and ironmaking blast furnaces.